Feels like head exploding when eating popping candy?

Right I was eating a bar with that stuff on it and my mam decided to try some. She didn't know that there was popping candy in it and when she tried it she just went mad! She was holding her head in her hands and it felt like her "head was exploding", she said. I just want to know is this an allergy to it or what cause I cant find anything about it.
 
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